RM38N0EC _57 Power Source / Network _111829 NETWORKING _0505699 LIN COMMUNICATION SYSTEM C

NETWORKING  LIN COMMUNICATION SYSTEM  B278588  Communication between ECUs connected by LIN Bus off  


DESCRIPTION

This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) stops for 10 seconds or more.

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from Priority
B278588 Communication between ECUs connected by LIN Bus off No communication between ID code box (immobiliser code ECU) and certification ECU (smart key ECU assembly) for 10 seconds or more.
·

Certification ECU (smart key ECU assembly)

·

ID code box (immobiliser code ECU)

·

Wire harness or connector


Entry&Start A

WIRING DIAGRAM

B633418E01
0.667,1.396 1.125,1.594 0.458,0.198 10 false E52 0.667,1.573 2.177,2.073 1.51,0.5 10 false Certification ECU (Smart Key ECU Assembly) 4.948,1.396 5.406,1.594 0.458,0.198 10 false E55 4.948,1.563 6.531,1.927 1.583,0.365 10 false ID Code Box (Immobiliser Code ECU) 5.01,0.885 5.625,1.083 0.615,0.198 10 false LIN1 4.844,0.698 5,0.896 0.156,0.198 10 false 2 1.958,0.875 2.417,1.073 0.458,0.198 10 false LIN 2.25,0.708 2.406,0.906 0.156,0.198 10 false 8 0.844,2.438 4.51,2.635 3.667,0.198 10 false : LIN Communication Line

CAUTION / NOTICE / HINT

NOTICE:
·

Before performing the inspection, check that DTC B278187 or B278C87 is not output.

Click herePower Source / Network>NETWORKING>LIN COMMUNICATION SYSTEM>DTC CHECK / CLEAR

·

When using the GTS with the ignition switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

·

Before replacing the certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU), refer to Service Bulletin.



PROCEDURE

1.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ID CODE BOX (IMMOBILISER CODE ECU)

Pre-procedure1

a.

Disconnect the E52 certification ECU (smart key ECU assembly) connector.


b.

Disconnect the E55 ID code box (immobiliser code ECU) connector.


Procedure1

c.

Measure the resistance according to the value(s) in the table below.

NOTICE:

Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the ignition switch from ON to off and wait for 180 seconds or more without operating any switches.


Standard Resistance:
Tester Connection Condition Specified Condition

Click Location & Routing(E52,E55)Location & Routing

Click Connector(E52)Instrument Panel>Instrument Panel Wire / Radio Wiring Sub-Assy / Telephone Computer Wire>Smart Key ECU Assembly

Click Connector(E55)Instrument Panel>Instrument Panel Wire / Radio Wiring Sub-Assy / Telephone Computer Wire>ID Code Box (Immobiliser Code ECU)

E52-8 (LIN) - E55-2 (LIN1) Ignition switch off Below 1 Ω
E52-8 (LIN) or E55-2 (LIN1) - Body ground Ignition switch off 10 kΩ or higher


Result:
Proceed to
OK
NG



Post-procedure1

d.

None



OK

2.CHECK FOR DTC

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.CHECK FOR DTC
a.

Connect the E52 certification ECU (smart key ECU assembly) connector.


b.

Check for DTCs.

Body Electrical > Entry&Start > Clear DTCs
50002 440

c.

Recheck for DTCs.

Body Electrical > Entry&Start > Trouble Codes
50001 440
Result:
Result Proceed to
B278588 is output A
B278588 is not output B




A

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

B

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)